Finding the Third Proportional to 78,687 and 170,500

Step by Step Solution

1. Step 1: Write the proportion equation
   78,687 : 170,500 = 170,500 : x
2. Step 2: Convert to fraction form
   78,687/170,500 = 170,500/x
3. Step 3: Cross multiply
   78,687x = 170,500 × 170,500
4. Step 4: Simplify right side
   78,687x = 29,070,250,000
5. Step 5: Solve for x
   x = 29,070,250,000/78,687
6. Step 6: Final answer
   x = 369,441.59